Tagbar is a beautiful plugin for Vim that can be used to view the classes, methods, types and other such entities defined in a source file. It does this by automatically generating the ctags information for the file and displays it in a split window. The information is displayed in a format similar to the class explorer in Visual Studio or Eclipse.
To toggle the tagbar window type :TagbarToggle
Map this command to any key sequence that you desire for ease of use.
Tried with: Vim 7.3 and Ubuntu 12.04 LTS